CA1211278A - Method for producing a clad steel pipe - Google Patents
Method for producing a clad steel pipeInfo
- Publication number
- CA1211278A CA1211278A CA000426367A CA426367A CA1211278A CA 1211278 A CA1211278 A CA 1211278A CA 000426367 A CA000426367 A CA 000426367A CA 426367 A CA426367 A CA 426367A CA 1211278 A CA1211278 A CA 1211278A
- Authority
- CA
- Canada
- Prior art keywords
- tubular
- clad pipe
- tubular blanks
- producing
- blanks
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/001—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by extrusion or drawing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
- B23K31/027—Making tubes with soldering or welding
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE:
A method for producing a clad steel pipe having resistance to corrosion and wear at the inner and/or the outer faces includes plural base pipes which are mechani-cally fixed and metallurgically joined by diffusion welding before the plural base pipes are elongated to produce an elongated clad steel pipe.
A method for producing a clad steel pipe having resistance to corrosion and wear at the inner and/or the outer faces includes plural base pipes which are mechani-cally fixed and metallurgically joined by diffusion welding before the plural base pipes are elongated to produce an elongated clad steel pipe.
Description
X~, The present invention relates to a method for producing a clad steel pipe.
Not only pressure tightness and heat resistance, but also corrosion resistance and wear resistance are indispensable to oil pipes or plant transferring pipes.
R corrosion-resisting double walled pipe which is cons-tructed of an inner pipe made of stainless steel and an outer pipe made of carbon steel is used for meeting such requirements. Both the inner pipe and the outer pipe should be tightly joined.
In the conventional method for producing this kind o a double walled pipe, the outer pipe is made of carbon steel and the inner pipe is made of stainless steel with both of them being joined by suitable ways such as a pipe expansion method using hydro pressure, the edges of the pipe being seal-welded so as not to slide along the axis of the pipe.
A welded pipe was also heated at a high tempe-rature and elongated by using a die and a mandrel or rolled and elongated by drawing.
In the above-mentioned method, however, heating to a high temperature at the time of rolling and application of machine power for extruding and drawing was required.
For instance, in the case of a double walled pipe made of carbon steel and stainless steel, the base pipes have to be kept at 1200 C for a long time, so that there are disadvantages as regards the maintenance of the heating apparatus and the machinery and the re~uirement for expen-sive apparatus itself on a large scaleO Furthermore, by using the above-mentioned conventional method, there are difficulties that scar or breakout in a pipe caused by the differences in the ductility and the deformation resis-tance at a high temperature between the dissimilar base metals which are joined together. Also, the bonding efficiency and the yield of products seem to be unsatis-factory.
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It is an object of the present invention to provide a method for producing a clad skeel pipe that shortens the producing process of the composite pipe, reduces the consumed energy, and increases accurac~v of the joined faces by bonding the joined faces together metallurgically.
According to the present invention there is provided a method of producing a clad pipe comprising coaxially assembling a plurality of ~lindrical tubular blanks, seal welding the longitudinal ends of said tubular blanks about the entire circumferential interface o~ said tubular blanks, maintaining vacuum conditions about said tubular blanks during said seal welding, metallurgically joining said seal welded tubular blanks by hot isostatic pressing to effect metallurgical bonding over the whole interface of said tubular blanks, and elongating said metallurgically bonded tubular blanks to thereby produce an elongated clad pipe.
According to the present invention there is also provided a method of producing a clad pipe comprising coaxially assembling inner and outer cylindrical tubular blanks, forming a radial projection on at least one longi-tudinal end of said inner tubular blank such that said projection abuts one longitudinal end of said outer tubular 25 blank, metallurgically bonding said inner and outer tubular blanks by hot isostatic pressing, and elongating said metallurgically bonded inner and outer tubular blanks to thereby produce an elongated clad pipe.
According to one aspect of the invention there 30 is provided a method of producing clad pipe comprising coaxially assembling a plurality of tubular blanks, seal welding the longitudinal ends of said tubular blanks about th.e entire circumferential interface of said tubular blanks utilizing electron beam welding, maintaining vacuum condi-
Not only pressure tightness and heat resistance, but also corrosion resistance and wear resistance are indispensable to oil pipes or plant transferring pipes.
R corrosion-resisting double walled pipe which is cons-tructed of an inner pipe made of stainless steel and an outer pipe made of carbon steel is used for meeting such requirements. Both the inner pipe and the outer pipe should be tightly joined.
In the conventional method for producing this kind o a double walled pipe, the outer pipe is made of carbon steel and the inner pipe is made of stainless steel with both of them being joined by suitable ways such as a pipe expansion method using hydro pressure, the edges of the pipe being seal-welded so as not to slide along the axis of the pipe.
A welded pipe was also heated at a high tempe-rature and elongated by using a die and a mandrel or rolled and elongated by drawing.
In the above-mentioned method, however, heating to a high temperature at the time of rolling and application of machine power for extruding and drawing was required.
For instance, in the case of a double walled pipe made of carbon steel and stainless steel, the base pipes have to be kept at 1200 C for a long time, so that there are disadvantages as regards the maintenance of the heating apparatus and the machinery and the re~uirement for expen-sive apparatus itself on a large scaleO Furthermore, by using the above-mentioned conventional method, there are difficulties that scar or breakout in a pipe caused by the differences in the ductility and the deformation resis-tance at a high temperature between the dissimilar base metals which are joined together. Also, the bonding efficiency and the yield of products seem to be unsatis-factory.
, ., #
o~
It is an object of the present invention to provide a method for producing a clad skeel pipe that shortens the producing process of the composite pipe, reduces the consumed energy, and increases accurac~v of the joined faces by bonding the joined faces together metallurgically.
According to the present invention there is provided a method of producing a clad pipe comprising coaxially assembling a plurality of ~lindrical tubular blanks, seal welding the longitudinal ends of said tubular blanks about the entire circumferential interface o~ said tubular blanks, maintaining vacuum conditions about said tubular blanks during said seal welding, metallurgically joining said seal welded tubular blanks by hot isostatic pressing to effect metallurgical bonding over the whole interface of said tubular blanks, and elongating said metallurgically bonded tubular blanks to thereby produce an elongated clad pipe.
According to the present invention there is also provided a method of producing a clad pipe comprising coaxially assembling inner and outer cylindrical tubular blanks, forming a radial projection on at least one longi-tudinal end of said inner tubular blank such that said projection abuts one longitudinal end of said outer tubular 25 blank, metallurgically bonding said inner and outer tubular blanks by hot isostatic pressing, and elongating said metallurgically bonded inner and outer tubular blanks to thereby produce an elongated clad pipe.
According to one aspect of the invention there 30 is provided a method of producing clad pipe comprising coaxially assembling a plurality of tubular blanks, seal welding the longitudinal ends of said tubular blanks about th.e entire circumferential interface of said tubular blanks utilizing electron beam welding, maintaining vacuum condi-
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tions about said tubular blanks during said seal welding, metallurgically joining said seal welded tubular blanks by hot isostatic pressing to effect metallurgical bonding over the whole interface of said tubular blanks, effecting said hot isostatic pressing in an atmosphere of an inert gas, and extruding said metallurgically bonded tubular blanks to thereby elongate the latter to thereby produce an elongated clad pipe which is relatively thin walled compared to the wall thickness of said metallurgically bonded tu~ular blanks before said extruding.
Pre~erred embodiments will now be described as examples in a non limitative manner having reference to the attached drawings wherein:
Figure 1 is a perspective view, partly broken away and in section, of a three-layer pipe being assemblea according to the present invention, Figure 2 is a sectional view of a three-layer pipe, Figure 3 is a sectional view showing seal welding of the end parts of the three-layer pipe.
Figure 4 is a sectional view showing diffusion welding of the three-layer pipe, Figure 5 is a sectional view showing the elongation of the three-layer pipe, and Figure 6 and Figure 7 are sectional views showing the deformation of a two-layer pipe.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention relates to a method for producing a clad steel pipe which is metallurgically bonded together at the joined faces of the base pipes. Plural base pipes are fixed, at least the end parts of the mutual interfaces of the base pipes are seal-welded, and after that, this fixed pipe body is elongated and deformed along the axis of the pipe. In a method Eor producing the compo-site clad steel pipe with the necessary length, seal-welding is effected around the end parts of the mutual
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tions about said tubular blanks during said seal welding, metallurgically joining said seal welded tubular blanks by hot isostatic pressing to effect metallurgical bonding over the whole interface of said tubular blanks, effecting said hot isostatic pressing in an atmosphere of an inert gas, and extruding said metallurgically bonded tubular blanks to thereby elongate the latter to thereby produce an elongated clad pipe which is relatively thin walled compared to the wall thickness of said metallurgically bonded tu~ular blanks before said extruding.
Pre~erred embodiments will now be described as examples in a non limitative manner having reference to the attached drawings wherein:
Figure 1 is a perspective view, partly broken away and in section, of a three-layer pipe being assemblea according to the present invention, Figure 2 is a sectional view of a three-layer pipe, Figure 3 is a sectional view showing seal welding of the end parts of the three-layer pipe.
Figure 4 is a sectional view showing diffusion welding of the three-layer pipe, Figure 5 is a sectional view showing the elongation of the three-layer pipe, and Figure 6 and Figure 7 are sectional views showing the deformation of a two-layer pipe.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention relates to a method for producing a clad steel pipe which is metallurgically bonded together at the joined faces of the base pipes. Plural base pipes are fixed, at least the end parts of the mutual interfaces of the base pipes are seal-welded, and after that, this fixed pipe body is elongated and deformed along the axis of the pipe. In a method Eor producing the compo-site clad steel pipe with the necessary length, seal-welding is effected around the end parts of the mutual
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interfaces with the mutual interfaces of the plural base pipes of the above-mentioned pipe body being under a vacuum.
Next, the fixed pipe body is placed into a well-known diffusion welding apparatus such as a hot isostaticpressing apparatus, and the mutual interfaces of the plural base pipes are bonded by diffusion welding. After that, the welded pipe is elongated and deformed along the axis of the pipe for obtaining a clad steel pipe of the necessary length~
~ practical example of the present invention is explained with reference to the drawings as follows.
Fig. 1 shows a middle pipe 1 made of carbon steel, an inner pipe 2 made of stainless steel and an outer pipe 3 made of titanium which are respectively fixed at room temperature, and which are assembled at a low temperature and at a high temperature as shown in Figure 1 so that they were fixed under the conditions of room temperature. A three-layer fixed pipe A (Fig. 2) which is mechanically and firmly fixed i5 obtained as shown in Figure 2. Next, the three-layer fixed pipe is placed in a well-known electron beam welding apparatus B. The end parts 5 are seal welded at 6, 6 at the joined end interfaces of the three base pipes 1, 2, 3. The welding is performed by a gun 4 over the whole of both end parts.
In this practical example, high vacuum conditions at the whole interfaces are provided before seal welding because of the use of an electron beam welding apparatus, and after seal welding, the vacuum condition is kept high.
After that, the three-layer fixed pipe A is placed in hot isostatic pressing apparatus C as shown in Figure
interfaces with the mutual interfaces of the plural base pipes of the above-mentioned pipe body being under a vacuum.
Next, the fixed pipe body is placed into a well-known diffusion welding apparatus such as a hot isostaticpressing apparatus, and the mutual interfaces of the plural base pipes are bonded by diffusion welding. After that, the welded pipe is elongated and deformed along the axis of the pipe for obtaining a clad steel pipe of the necessary length~
~ practical example of the present invention is explained with reference to the drawings as follows.
Fig. 1 shows a middle pipe 1 made of carbon steel, an inner pipe 2 made of stainless steel and an outer pipe 3 made of titanium which are respectively fixed at room temperature, and which are assembled at a low temperature and at a high temperature as shown in Figure 1 so that they were fixed under the conditions of room temperature. A three-layer fixed pipe A (Fig. 2) which is mechanically and firmly fixed i5 obtained as shown in Figure 2. Next, the three-layer fixed pipe is placed in a well-known electron beam welding apparatus B. The end parts 5 are seal welded at 6, 6 at the joined end interfaces of the three base pipes 1, 2, 3. The welding is performed by a gun 4 over the whole of both end parts.
In this practical example, high vacuum conditions at the whole interfaces are provided before seal welding because of the use of an electron beam welding apparatus, and after seal welding, the vacuum condition is kept high.
After that, the three-layer fixed pipe A is placed in hot isostatic pressing apparatus C as shown in Figure
4 at a prescribed temperature and prescribed pressure in an argon gas atmosphere, and metalluirgical bonding is achieved over the whole interfaces of the base pipes 1, 2, 3 so that a metallurgical joined three-layer p.ipe G ~ 3~
,, ~, . .~
~2~2t~
body A is obtained. Thereafter, the three-layer pipe body A is extruded by using a die 7 and a mandrel 8 as shown in Figure 5, whereby a thin and elongated three-layer clad pipe A' is obtained.
In this process, there are not liable to arise wrinkles or protrusions of the pipe because, as described above, in the three-layer pipe body, the three base pipes 1, 2, 3 are metalluryically and tightly bonded together over the whole area before drawing.
Also, with the middle pipe made of carbon steel, the inner pipe made of stainless steel and the outer pipe made of titanium as described above, both end parts of all of them are open as shown in the drawings. The base pipe may have one side of the end parts closed according to the present invention. That is to say, one side of the outer pipe 3 is already closed so that later seal welding is merely needed at the other end part.
The three-layer pipe body A contracts upon cooling after being metallurgically bonded in the hot isostatic pressing apparatus. For instance, in the case where the coefficient of thermal expansion of the outer base pipe is smaller than that of the inner base pipe, the inner side of the base pipe contracts more during cooling, pulling apart of the bonded part of both base pipes results, and therefore the bonding strength is lowered. Therefore, to counteract such a case, the core material is of a coeffi-cient of thermal expansion equal to or smaller than that of the outer base pipe so that the core material suppresses the function of pulling apart the bonded parts of both base pipes. There are the two cases of taking out the core material later or making a hole in the core material and after that, drawing and elongating along the axis by the other way.
After the long three-layer clad pipe is obtained and it is cut into the prescribed unit lengths of pipe, the interfaces of the cut unit pipes are all me-tallurgically -~, bonded together, and the pipes satisfactorily have the original function. Additionally, it is needless to say that the practical uses of the present invention are not limited to the above~mentloned practical examples. For instance, it is possible to produce not only the three-layer pipe but also a double-layer pipe, and there are various processes such as TIG welding for seal welding or drawn forming in elongating along the axis of the pipe.
Additionally, as described above, a long clad pipe which is elongated and deformed is usually used after cutting to prescribed unit lengths of pipe, but there are cases where a long clad pipe which is elongated and deformed is used as it is. In such a case, for instance, a corrosion resistant base pipe 2 and a carbon steel pipe are respectively used for the inner side and the outer side as shown in Figure 6. The corrosion resistant base pipe 2 is metallurgically bonded in that both end parts (or one end part) protrudes beyond the outer pipe 3 and is deformed. A product having corrosion resistance at both end parts is obtained as shown in Figure 7.
As described above, the present invention makes it possible to obtain a clad pipe of which the metallur-gical joining is uniformly accomplished at the joined faces over the whole length of a long and thin pipe by using a short and thick base pipe. In addition, joining of the whole faces is easily performed independently of the length and the thickness of the short base pipe. Also, the multiple interfaces of the plural base fixed pipes are diffusion welded at the same time. There is the advantage that the diffusion welding is effective at a low temperature compared with the rolling and welding in the same cases, and this results in less consumed eneryy.
It is possible to use an extrusion forming apparatus as it is, such as for ordinary carbon steel pipes, because 4 ~
~14.A~ ~"3 base pipes are completely, metallurgically bonded together by diffusion welding. Imperfections in the products such as wrinkles or breakouts are not caused during elongation and forming, and moreover, there is the advantage that it is possible to form the clad pipe at a low temperature because it is different from forming a clad pipe by rolling and welding.
,, ~, . .~
~2~2t~
body A is obtained. Thereafter, the three-layer pipe body A is extruded by using a die 7 and a mandrel 8 as shown in Figure 5, whereby a thin and elongated three-layer clad pipe A' is obtained.
In this process, there are not liable to arise wrinkles or protrusions of the pipe because, as described above, in the three-layer pipe body, the three base pipes 1, 2, 3 are metalluryically and tightly bonded together over the whole area before drawing.
Also, with the middle pipe made of carbon steel, the inner pipe made of stainless steel and the outer pipe made of titanium as described above, both end parts of all of them are open as shown in the drawings. The base pipe may have one side of the end parts closed according to the present invention. That is to say, one side of the outer pipe 3 is already closed so that later seal welding is merely needed at the other end part.
The three-layer pipe body A contracts upon cooling after being metallurgically bonded in the hot isostatic pressing apparatus. For instance, in the case where the coefficient of thermal expansion of the outer base pipe is smaller than that of the inner base pipe, the inner side of the base pipe contracts more during cooling, pulling apart of the bonded part of both base pipes results, and therefore the bonding strength is lowered. Therefore, to counteract such a case, the core material is of a coeffi-cient of thermal expansion equal to or smaller than that of the outer base pipe so that the core material suppresses the function of pulling apart the bonded parts of both base pipes. There are the two cases of taking out the core material later or making a hole in the core material and after that, drawing and elongating along the axis by the other way.
After the long three-layer clad pipe is obtained and it is cut into the prescribed unit lengths of pipe, the interfaces of the cut unit pipes are all me-tallurgically -~, bonded together, and the pipes satisfactorily have the original function. Additionally, it is needless to say that the practical uses of the present invention are not limited to the above~mentloned practical examples. For instance, it is possible to produce not only the three-layer pipe but also a double-layer pipe, and there are various processes such as TIG welding for seal welding or drawn forming in elongating along the axis of the pipe.
Additionally, as described above, a long clad pipe which is elongated and deformed is usually used after cutting to prescribed unit lengths of pipe, but there are cases where a long clad pipe which is elongated and deformed is used as it is. In such a case, for instance, a corrosion resistant base pipe 2 and a carbon steel pipe are respectively used for the inner side and the outer side as shown in Figure 6. The corrosion resistant base pipe 2 is metallurgically bonded in that both end parts (or one end part) protrudes beyond the outer pipe 3 and is deformed. A product having corrosion resistance at both end parts is obtained as shown in Figure 7.
As described above, the present invention makes it possible to obtain a clad pipe of which the metallur-gical joining is uniformly accomplished at the joined faces over the whole length of a long and thin pipe by using a short and thick base pipe. In addition, joining of the whole faces is easily performed independently of the length and the thickness of the short base pipe. Also, the multiple interfaces of the plural base fixed pipes are diffusion welded at the same time. There is the advantage that the diffusion welding is effective at a low temperature compared with the rolling and welding in the same cases, and this results in less consumed eneryy.
It is possible to use an extrusion forming apparatus as it is, such as for ordinary carbon steel pipes, because 4 ~
~14.A~ ~"3 base pipes are completely, metallurgically bonded together by diffusion welding. Imperfections in the products such as wrinkles or breakouts are not caused during elongation and forming, and moreover, there is the advantage that it is possible to form the clad pipe at a low temperature because it is different from forming a clad pipe by rolling and welding.
Claims (10)
1. A method of producing a clad pipe comprising coaxially assembling a plurality of cylindrical tubular blanks, seal welding the longitudinal ends of said tubular blanks about the entire circumferential interface of said tubular blanks, maintaining vacuum conditions about said tubular blanks during said welding, metallurgically joining said seal welded tubular blanks by hot isostatic pressing to effect metallurgical bonding over the whole interface of said tubular blanks, and elongating said metallurgically bonded tubular blanks to thereby produce an elongated clad pipe.
2. A method of producing a clad pipe according to claim 1, wherein said hot isostatic pressing is effected in an argon gas atmosphere.
3. A method of producing a clad pipe according to claim 1, wherein said seal welding is effected by electron beam welding.
4. A method of producing a clad pipe according to claim 1, wherein said elongated clad pipe is a triple layer pipe.
5. A method of producing a clad pipe according to claim 1, wherein said elongated clad pipe is a double layer clad pipe.
6. A method of producing a clad pipe according to claim 1, wherein said plurality of tubular blanks comprises an inner tubular blank of stainless steel, an outer tubular blank of titanium and an intermediate tubular blank of carbon steel.
7. A method of producing a clad pipe according to claim 1, wherein said plurality of tubular blanks comprises an inner tubular blank and an outer tubular blank, said inner tubular blank having a coefficient of thermal expansion equal to or less than that of said outer tubular blank.
8. A method of producing a clad pipe comprising coaxially assembling inner and ouater cylindrical tubular blanks, forming a radial projection on at least one longi-tudinal end of said inner tubular blank such that said projection abuts one longitudinal end of said outer tubular blank, metallurgically bonding said inner and outer tubular blanks by hot isostatic pressing, and elongating said metallurgically bonded inner and outer tubular blanks to thereby produce an elongated clad pipe.
9. A method of producing a clad pipe according to claim 8 , further comprising forming a radial projection on the other longitudinal end of said inner tubular blank such that the last said projection abuts the other longi-tudinal end of said outer tubular blank.
10. A method of producing a clad pipe comprising coaxially assembling a plurality of tubular blanks, seal welding the longitudinal ends of said tubular blanks about the entire circumferential interface of said tubular blanks utilizing electron beam welding, maintaining vacuum condi-tions about said tubular blanks during said seal welding, metallurgically joining said seal welded tubular blanks by hot isostatic pressing to effect metallurgical bonding over the whole interface of said tubular blanks, effecting said hot isostatic pressing in an atmosphere of an inert gas, and extruding said metallurgically bonded tubular blanks to thereby elongate the latter to thereby produce an elongated clad pipe which is relatively thin-walled compared to the wall-thickness of said metallurgically bonded tubular blanks before said extruding.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3314264A DE3314264C2 (en) | 1983-04-20 | 1983-04-20 | Process for the production of steel composite pipes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1211278A true CA1211278A (en) | 1986-09-16 |
Family
ID=6196846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000426367A Expired CA1211278A (en) | 1983-04-20 | 1983-04-21 | Method for producing a clad steel pipe |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4795078A (en) |
| CA (1) | CA1211278A (en) |
| DE (1) | DE3314264C2 (en) |
| FR (1) | FR2544638B1 (en) |
| GB (1) | GB2141645B (en) |
| NL (1) | NL8301393A (en) |
| SE (1) | SE447804B (en) |
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| US2775029A (en) * | 1951-03-02 | 1956-12-25 | Arthur S Bennett | Method of making composite metal bodies |
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| JPS5736017A (en) * | 1980-08-15 | 1982-02-26 | Hitachi Ltd | Manufacture of sheath for nuclear fuel element |
| DE3039428C2 (en) * | 1980-10-18 | 1985-05-02 | Sumitomo Kinzoku Kogyo K.K., Osaka | Process for the manufacture of clad steel products |
| GB2085330B (en) * | 1980-10-20 | 1984-01-18 | Sumitomo Metal Ind | Method of preparing clad steels |
| DE3044589C2 (en) * | 1980-11-24 | 1985-08-08 | Mannesmann AG, 4000 Düsseldorf | Process for the production of seamless, externally clad pipes |
| JPS57195590A (en) * | 1981-05-29 | 1982-12-01 | Kawasaki Heavy Ind Ltd | Production of clad pipe |
| GB2100641B (en) * | 1981-06-11 | 1985-10-09 | Kawasaki Steel Co | A method of manufacturing bimetallic tubes. |
| US4518111A (en) * | 1983-10-17 | 1985-05-21 | Explosive Fabricators, Inc. | Method of fabricating a bi-metal tube |
-
1983
- 1983-04-13 SE SE8302046A patent/SE447804B/en not_active IP Right Cessation
- 1983-04-14 GB GB08310094A patent/GB2141645B/en not_active Expired
- 1983-04-20 DE DE3314264A patent/DE3314264C2/en not_active Expired
- 1983-04-20 NL NL8301393A patent/NL8301393A/en not_active Application Discontinuation
- 1983-04-21 CA CA000426367A patent/CA1211278A/en not_active Expired
- 1983-04-25 FR FR8306759A patent/FR2544638B1/en not_active Expired
-
1986
- 1986-05-13 US US06/863,820 patent/US4795078A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE3314264A1 (en) | 1984-10-25 |
| SE8302046D0 (en) | 1983-04-13 |
| FR2544638B1 (en) | 1987-12-04 |
| NL8301393A (en) | 1984-11-16 |
| FR2544638A1 (en) | 1984-10-26 |
| GB8310094D0 (en) | 1983-05-18 |
| SE447804B (en) | 1986-12-15 |
| US4795078A (en) | 1989-01-03 |
| SE8302046L (en) | 1984-10-14 |
| GB2141645A (en) | 1985-01-03 |
| GB2141645B (en) | 1986-08-13 |
| DE3314264C2 (en) | 1987-04-30 |
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